<!-- eslint-disable eqeqeq -->
<template>
  <div class="article-container">
    <!-- 导航栏 -->
    <van-nav-bar
      class="page-nav-bar"
      left-arrow
      title="头条"
    ></van-nav-bar>
    <!-- /导航栏 -->

    <div class="main-wrap">
      <!-- 加载中 -->
      <div v-if="loading" class="loading-wrap">
        <van-loading
          color="#3296fa"
          vertical
        >加载中</van-loading>
      </div>
      <!-- /加载中 -->

      <!-- 加载完成-文章详情 -->
      <div v-else-if="article.title" class="article-detail">
        <!-- 文章标题 -->
        <h1 class="article-title">{{ article.title }}</h1>
        <!-- /文章标题 -->

        <!-- 用户信息 -->
        <van-cell class="user-info" center :border="false">
          <van-image
            class="avatar"
            slot="icon"
            round
            fit="cover"
            :src="article.aut_photo"
          />
          <div slot="title" class="user-name">{{ article.aut_name }}</div>
          <div slot="label" class="publish-date">{{ article.pubdate | relativeTime }}</div>
          <!-- 模板中的$event是事件参数
            当我们传给子组件的数据既要使用又要修改
            :is_followed="article.is_followed"
            传递：props
            修改：自定义事件
            @update-follow="article.is_followed = $event"
            简写形式：在组件中用v-model
            value = "article.is_followed"
            @input = "article.is_followed = $event"
            如果需修改v-model的规则名称，可以通过子组件的model名称来配置修改
            ---一个组件上只能使用一次model，如果有多个数据需要实现类似于v-model的效果，可使用属性的.sync修饰符  -->
          <FollowUser
            v-model="article.is_followed"
            class="follow-btn"
            :aut_id="article.aut_id"
            />
          <!-- <van-button
            v-if="article.is_followed"
            class="follow-btn"
            round
            size="small"
            :loading="isFollowLoading"
            @click="onFollow"
          >已关注</van-button>
          <van-button
            v-else
            class="follow-btn"
            type="info"
            color="#3296fa"
            round
            size="small"
            icon="plus"
            :loading="isFollowLoading"
            @click="onFollow"
          >关注</van-button> -->
        </van-cell>
        <!-- /用户信息 -->

        <!-- 文章内容 -->
        <div class="article-content markdown-body"
            v-html="article.content"
            ref="article-content">
        </div>
        <van-divider>正文结束</van-divider>
            <!-- 底部区域 -->
            <!-- 文章评论 -->
            <comment-list
                :list="commentList"
                :source="article.art_id"
                @onload-success="totalCommentCounts = $event.total_count"
                @reply-click="onReplyClick" />
            <!-- 文章评论 -->
            <div class="article-bottom">
        <van-button
            class="comment-btn"
            type="default"
            round
            size="small"
            @click="isPostShow = true"
        >写评论</van-button>
        <van-icon
            name="comment-o"
            :info="totalCommentCounts"
            color="#777"
        />
        <CollectArticle
            v-model="article.is_collected"
            :article-id="article.art_id"
        />
        <LikeArticle
            v-model="article.attitude"
            :article-id="article.art_id"
         />
        <van-icon name="share" color="#777777"></van-icon>
        </div>
        <!-- /底部区域 -->
        <!-- 发布评论 -->
        <van-popup v-model="isPostShow" position="bottom">
            <PostComment :target="article.art_id" @post-success = 'onSuccess' />
        </van-popup>
        <!-- 发布评论 -->
      </div>
      <!-- /加载完成-文章详情 -->

      <!-- 加载失败：404 -->
      <div v-else-if="errorStatus == 404" class="error-wrap">
        <van-icon name="failure" />
        <p class="text">该资源不存在或已删除！</p>
      </div>
      <!-- /加载失败：404 -->

      <!-- 加载失败：其它未知错误（例如网络原因或服务端异常） -->
      <div v-else class="error-wrap">
        <van-icon name="failure" />
        <p class="text">内容加载失败！</p>
        <van-button class="retry-btn" @click="loadArticleInfo">点击重试</van-button>
      </div>
      <!-- /加载失败：其它未知错误（例如网络原因或服务端异常） -->
    </div>
    <!-- 回复评论 -->
     <van-popup v-model="isReplyShow" position="bottom" style="height: 100%;">
        <CommentReply v-if="isReplyShow" :comment="currentComment" @close="isReplyShow = false" />
    </van-popup>
    <!-- 回复评论 -->
  </div>
</template>

<script>
import { getArticleListById } from '@/api/article'
import { ImagePreview } from 'vant'
import FollowUser from '@/components/follow-user'
import CollectArticle from '@/components/collect-article'
import LikeArticle from '@/components/like-article'
import CommentList from './components/comment-list.vue'
import PostComment from './components/comment-post.vue'
import CommentReply from './components/comment-reply.vue'
// ImagePreview({
//   images: [
//     'https://img.yzcdn.cn/vant/apple-1.jpg',
//     'https://img.yzcdn.cn/vant/apple-2.jpg'
//   ],
//   // 预览图片的起始位置
//   startPosition: 1,
//   // 点击关闭
//   onClose () {
//     // do something
//   }
// })
export default {
  name: 'ArticleIndex',
  components: {
    FollowUser,
    CollectArticle,
    LikeArticle,
    CommentList,
    PostComment,
    CommentReply
  },
  provide () {
    // 使用函数的形式，可以访问到 `this`
    return {
      articleId: this.articleId
    }
  },
  props: {
    articleId: {
      type: [Number, String],
      required: true
    }
  },
  data () {
    return {
      article: {}, // 文章详情
      loading: true, // 加载中的默认状态
      errorStatus: 0, // 失败的状态码
      totalCommentCounts: 0,
      isPostShow: false,
      commentList: [],
      isReplyShow: false,
      currentComment: {} // 点击回复，带过来的需要回复的原评论
    }
  },
  computed: {},
  watch: {},
  created () {
    this.loadArticleInfo()
  },
  mounted () {},
  methods: {
    async loadArticleInfo () {
      try {
        this.loading = true
        // 随机错误模拟写法
        if (Math.random() > 0.5) {
          JSON.parse('yirryioytiuoeyoetyoio')
        }
        const res = await getArticleListById(this.articleId)
        this.article = res.data.data
        setTimeout(() => {
        //   console.log(this.$refs['article-content'])
          this.previewImage()
        }, 0)
        console.log('res', res)
      } catch (error) {
        if (error.response && error.response.status === 404) {
          this.errorStatus = 404
        }
        this.$toast('获取失败')
      }
      this.loading = false
    },
    previewImage () {
      const articleContent = this.$refs['article-content']
      const imgs = articleContent.querySelectorAll('img')
      const imgUrl = []
      imgs.forEach((img, index) => {
        imgUrl.push(img.src)
        img.onclick = () => {
          ImagePreview({
            imgUrl,
            // 预览图片的起始位置
            startPosition: index,
            // 点击关闭
            onClose () {
              // do something
            }
          })
        }
      })
    },
    onSuccess (data) {
      this.isPostShow = false // 关闭弹窗
      this.commentList.unshift(data.new_obj) // 最新评论前置
    },
    onReplyClick (comment) {
      this.currentComment = comment
      this.isReplyShow = true
    }
  }
}
</script>

<style scoped lang="less">
@import './github-markdown.css';
.article-container {
  .main-wrap {
    position: fixed;
    left: 0;
    right: 0;
    top: 92px/2;
    bottom: 88px/2;
    overflow-y: scroll;
    background-color: #fff;
  }
  .article-detail {
    .article-title {
      font-size: 40px/2;
      padding: 50px/2 32px/2;
      margin: 0;
      color: #3a3a3a;
    }

    .user-info {
      padding: 0 32px/2;
      .avatar {
        width: 70px/2;
        height: 70px/2;
        margin-right: 17px/2;
      }
      .van-cell__label {
        margin-top: 0;
      }
      .user-name {
        font-size: 24px/2;
        color: #3a3a3a;
      }
      .publish-date {
        font-size: 23px/2;
        color: #b7b7b7;
      }
      .follow-btn {
        width: 170px/2;
        height: 58px/2;
      }
    }

    .article-content {
      padding: 55px/2 32px/2;
      /deep/ p {
        text-align: justify;
      }
    }
  }

  .loading-wrap {
    padding: 200px/2 32px/2;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: #fff;
  }

  .error-wrap {
    padding: 200px/2 32px/2;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: #fff;
    /deep/.van-icon {
      font-size: 122px/2;
      color: #b4b4b4;
    }
    .text {
      font-size: 30px/2;
      color: #666666;
      margin: 33px/2 0 46px/2;
    }
    .retry-btn {
      width: 280px/2;
      height: 70px/2;
      line-height: 70px/2;
      border: 1px/2 solid #c3c3c3;
      font-size: 30px/2;
      color: #666666;
    }
  }

  .article-bottom {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    justify-content: space-around;
    align-items: center;
    box-sizing: border-box;
    height: 88px/2;
    border-top: 1px/2 solid #d8d8d8;
    background-color: #fff;
    .comment-btn {
      width: 282px/2;
      height: 46px/2;
      border: 2px/2 solid #eeeeee;
      font-size: 30px/2;
      line-height: 46px/2;
      color: #a7a7a7;
    }
    .van-icon {
      font-size: 40px/2;
      .van-info {
        font-size: 16px/2;
        background-color: #e22829;
      }
    }
  }
}
</style>
